. >> i'm very, very proud to be a part of this weekend and to see the obamas and the bidens for four more years. >> the first lady and her daughters joined the crowd of more than 5,000 to honor military families. >> to america's military kids, let me tell you, make no mistake about it, you are an important part of the greatest military on earth. >> president obama will take the oath of office at the white house on sunday. the date set out in the constitution. but crews are busy making sure everything will be ready for the big public ceremony. >> seating has been set up outside of the capitol to hold some of the 800,000 people expected here on monday, a much smaller crowd than four years ago. this family came all the way from california. >> i'm going to feel so great to see him take that oath one more time. >> the three-day celebration kicked off with a national day of service. the president pitched in at a washington, d.c. elementary school. >> everybody here, adults to children, understands the importance of giving back. >> 17-year-old madelyn hart net and other students sent messag